Filter.



PATENIED AUG. 8, 1905.

H. BREYER.

FILTER.

APPLICATION FILED we. 25, 1904.

UNITED STATES PATENT oFFIoE.

HENRIETTE BREYER, OF KOGEL, AUSTRIA-HUNGARY, ASSIGNOR OF FOUR-FIFTHS TOALFRED JURNITSOHEK VON I/VEHRSTEDT, OF CASTLE PUOHBERG, NEAR WELS,AUSTRIA-HUNGARY.

FILTER.

Specification of Letters Patent.-

Patented Aug. 8, 1905.

Application filed August 25, 1904:. Serial No. 222,141.

To all whom it may concern:

Be it known that .I, HENRIETTE BREYER, a subject of the Emperor ofAustria-Hungary, residing at Kogel, near N eubengbach, Lower Austria,Empire of Austria-Hungary, have invented certain new and usefulImprovements in Filters, of which the following is a specification.

This invention relates to filters in which the parts that effect thecleansing of the liquid consist of vertical perforated metal platesprovided with a covering or envelop of woven material that carries adeposit of filtering medium. Hitherto in such filters the said filteringmedium has been formed of fibrous materials of the most varied kinds,such as vegetable fibers, cellulose, paper stuff, or asbestos. Vegetablefibrous materials have the drawback that the filtering medium composedthereof cannot be cleaned sufficiently after use to enable the filter towork permanently in a satisfactory manner or to deliver for a protractedperiod a filtrate which is completely or almost free from bacteria,whereas asbestos can only be reduced by tedious and costly means to thedegree of fineness of fiber required to enable it to form a perfectfiltering medium. Previous attempts to apply pulverulent filteringmediums to the Woven fabric in filters of the construction referred toat the commencement hereof have yielded unsatisfactory results, becausethe filtering mediums employed did not adhere firmly to the wovenfabric, and special binding or adhesive agents had to be employed forthe purpose of fixing the filtering medium to the fabric.

I have now discovered that brick-dust or brick-flour deposited byprecipitation from a state of suspension in liquid onto the wovenfabrics surrounding the vertically-arranged perforated metal plates isextremely suitable for the production of filtering mediums and that itforms coats or coverings which adhere in such a manner as to allow ofthe filtration of water or other liquids to be effected in a manner thatsatisfies all requirements.

'limet'er.

I prefer to form the filtering layer of brickdust or brick-flour havinggrains or particles of different sizes.

A suitable filtering medium according to this invention is produced bypulverizing hard-burned bricks, sifting the powder, and then mixinggrains or particles having a diameter of about 0.09' millimeter Withgrains or particles having a diameter of about 0.3 mil- This mixturewhen precipitated upon woven fabrics forms a layer of such nature thatthe coarser grains will lie directly upon the woven fabric and will becovered by the finer grains. This filtering medium adheres firmly to thewoven fabric and has a perfect cleansing action.

The accompanying drawings represent in Figure l a vertical longitudinalsection and in Fig. 2 a vertical cross-section of a form of a filtershown by way of example and in which the new filtering material isintroduced.

The filter-box a, which is closed byacover b, is provided with a tube 0for the admission of the raw unfiltered water, a tube (Z for thedischarge of the filtered water, and a tube 6 for the discharge of themud deposits. Within the box a are arranged the filter elements f,consisting of vertically-standing perforated metal plates which arecovered by a textile fabric, upon which latter the filtering medium g isprecipitated.

What I claim as new is In a filter, the combination with perforatedmetallic plates provided with anenvelop of textile fabric, of afiltering medium deposited by precipitation upon the said fabric andfirmly adhering to the same and consisting of brickdust having thegrains thereof of different sizes.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

HENRIETTE BREYER.

